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-rw-r--r--lib/PublicInbox/Syscall.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/PublicInbox/Syscall.pm b/lib/PublicInbox/Syscall.pm
index 46496bca..412ca64f 100644
--- a/lib/PublicInbox/Syscall.pm
+++ b/lib/PublicInbox/Syscall.pm
@@ -454,7 +454,7 @@ no warnings 'once';
 
 *recv_cmd4 = sub ($$$) {
         my ($sock, undef, $len) = @_;
-        vec($_[1], ($len + 1) * 8, 1) = 0;
+        vec($_[1] //= '', ($len + 1) * 8, 1) = 0;
         my $cmsghdr = "\0" x msg_controllen; # 10 * sizeof(int)
         my $iov = pack('P'.TMPL_size_t, $_[1], $len);
         my $mh = pack('PL' . # msg_name, msg_namelen (socklen_t (U32))